Mercurial > hg > blitz_stable

annotate src/org/dancres/blitz/entry/EntryRepository.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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children
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1 package org.dancres.blitz.entry;
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2
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3 import java.io.IOException;
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4
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5 import org.dancres.blitz.mangler.MangledField;
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6 import org.dancres.blitz.mangler.MangledEntry;
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7
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8 import org.dancres.blitz.oid.OID;
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9
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10 import org.dancres.blitz.stats.Stat;
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11 import org.dancres.blitz.config.EntryConstraints;
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12
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13 /**
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14 Entry's are separated by type with all instances of a particular type
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15 held in one EntryRepository instance.
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16 */
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17 public interface EntryRepository {
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18 public static final String ROOT_TYPE = "java.lang.Object";
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19
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20 public EntryConstraints getConstraints();
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21
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22 /**
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23 Called to setup schema information, create indexes etc - should only
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24 be called once in response to <code>true</code> being returned from
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25 <code>didntExist()</code>
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26 */
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27 public void setFields(MangledField[] aSetOfFields) throws IOException;
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28
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29 /**
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30 Indicates if we were created for the first time as the result of
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31 a call to <code>EntryRepositoryFactory.get()</code>. Note that this
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32 flag is reset after <code>setFields()</code> is called. Thus, even
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33 if an EntryRepository has been informed of children, it will still
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34 return <code>true</code> until <code>setFields</code> is called.
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35 */
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36 public boolean noSchemaDefined();
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37
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38 /**
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39 Tells this Repository about a subtype which has just been created
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40 and would need to be search if this type were the specified template.
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41 */
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42 public void addSubtype(String aType) throws IOException;
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43
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44 /**
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45 Return a list of all currently known subtypes
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46 */
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47 public String[] getSubtypes();
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48
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49 /**
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50 Write returns it's result via the passed WriteEscort. i.e. If
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51 it returns without IOException, the write is deemed to have succeeded.
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52 The caller is responsible for recovering the appropriate information
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53 from the WriteEscort.
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54
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55 @param anExpiry an absolute expiry time
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56 */
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57 public void write(MangledEntry anEntry, long anExpiry,
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58 WriteEscort anEscort)
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59 throws IOException;
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60
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61 /**
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62 Locate suitable matches for the passed template and offer them
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63 to the SearchVisitor. Note that there is no return value from this
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64 method because the appropriate value is passed to the SearchVisitor
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65 via offer which it then accepts. Thus the caller is expected to
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66 interrogate the SearchVisitor implementation to determine the outcome.
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67
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68 @param aTemplate can be null or a wildcard MangledEntry indicating an
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69 Entry<class>* search or a MangledEntry with keys which results in an
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70 indexed search
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71 */
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72 public void find(MangledEntry aTemplate, SearchVisitor aVisitor)
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73 throws IOException;
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74
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75 /**
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76 Under some circumstances, we wish to offer a visitor the chance to
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77 acquire a specific Entry identified by aOID. This step must be
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78 managed by the Repository (as are finds) in order to handle such
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79 issues as paging in from disk etc.
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80
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81 @return <code>true</code> if an offer was made. If an offer wasn't made
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82 it's due to the Entry no longer being available. The caller would be
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83 best advised to stop the search at this point to save I/O.
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84 */
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85 public boolean find(SearchVisitor aVisitor, OID aOID, MangledEntry aPreload)
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86 throws IOException;
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87
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88 public LongtermOffer getOffer(OID anOID) throws IOException;
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89
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90 /**
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91 @return an OpInfo if the operation was successful, <code>null</code>
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92 otherwise
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93 */
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94 public boolean renew(OID aOID, long anExpiry) throws IOException;
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95
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96 /**
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97 @return an OpInfo if the operation was successful, <code>null</code>
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98 otherwise
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99 */
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100 public boolean cancel(OID aOID) throws IOException;
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101
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102 /**
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103 @return the Entry type held in this repository
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104 */
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105 public String getType();
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106
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107 /**
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108 @return the number of Entry's stored on disk
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109 */
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110 public int getTotalStoredEntries() throws IOException;
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111
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112 /**
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113 @return the number of Entry's stored in total including those uncommitted
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114 in cache
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115 */
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116 public int getTotalLiveEntries();
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117 }